That’s Chris Cochran, who is the Assistant Director for the state Office of Traffic Safety. The O-T-S study showed 14 percent, or one in seven drivers were under the influence of drugs, while just 7 percent had alcohol in their system. It was a voluntary survey, where over 13-hundred drivers consented to either breath or saliva samples. Cochran says the tests can show what drugs are in their system- but not the amount.